# Basic Tensor Question

Given a tensor with upper indices in special relativity, what do I know of the corresponding tensor with lower indices? Why?
For example, for the antisymmetric tensor $$\varepsilon ^{iklm}$$, what is $$\varepsilon _{iklm}$$?

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Physics Monkey
Homework Helper
How do you always find the lowered components given the upper components? The answer is contraction with the metric.

So now we're down to this question: What is contraction?

(thanks by the way)

robphy
Homework Helper
Gold Member
robphy said:
Great, thanks.

jcsd